Process of obtaining by-products from gases.



lG.' HvILGENSTOGK. Pnocnss of OBTAINING mmonnows FROM GASES. y AAPILIUATION IKILED DEO. 3, 1908. 8,974, Patented July 27, 1909.

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'cusfrav HILcENs'rooK, or DAHLHAUsEN-oN-THE-RUHR, GERMANY."

' To all whom it may concern: Be 1t known that I, GUsTAv 'HILGEN-srocii, a sub j ect ofthe King oi' Prussia, E1neror .of Germany, and aresident `of Dahl-- "us en-on-the-Ruiir', Westphalia, Kingdom ofl'crussia, Germany, have invented certain newand usefullmprovements inProcesses of- `Obtaining Buy-'Products from Gases Reslltin" from the DryDistillation of Coal and other' aterials, of which. the following is aspecification. v The removal of tar from the gases, resulting vof' thedry distillation of coal and other y materials`; has' been formerlyeffected by A f lin andwashing the gases; the ammonia salts eingobtained by distilling the amvu ionia lipor with steam in special stillsand 'leading t 'e' vapors irito an' acid bath. Nowadays'tlie terrdencji`is to remove the tar at higher temperatures in order to conduct theGases freedpfrom tar directly into the acid bath for obtaining ammoniain the form of salts. I l

According t'o'my invention the removal of tau is highly simplified andfacilitated by dividing the gases after their formation in retort's 'orcokebvens fractionally into two parts,l a larger and a smaller one; Thelatter part'of the last 'hours of the distillation of a charge, which ispractically freefrorn tar, is .added to the former and larger par-tafter the same by any method `has been 'freed from tar.

This process oders special advantages `for eliminating the tar from thegases at higher temperatures, preventing the condensation of water andtherefore allowing the direct precipitation of the ammonia salt in thesaturater by means oi' an acid.

The best method of eliminating the tar at high temperatures is that bymeans of the tar injector, in which method tar,gas water containing taror both are pressed into an injector, drawing in the gases and mixing 45them with the tar, gas water or both so that the gases containing tarare 'thoroughly' mixed within the injector; the injector here- I byserves a double purpose, iirst` purifying the gas from tar and thenassisting the draft of the gases by its sucking power. By means of thetar injector it is possible'to re-l move the tar at once, the remainderbeing so small that it maybe practically neglected:

e In the accompanying drawings a plant i'sdiagrammatically represented,by which thespeeination ci tercera Patent. Application Bled December 190`8.-= Serial No. 485.21'1L Patented July 27,I 1909.

i process-fis carried out .in combination with coke ovensior therecovery of. by-products. Figure 1 shows tazplan-view oi' the plant,

.valve 7 to the gas conduit'S.

Fig. 2 shows a section on the line A--B of `Figl 1,v Fig; 3 shows asection onthe line 6e- Referring to' the drawings, 1 is a colte-oven,-2Y the doors which are airtightly closed; each oven hasan o enin'glconducting to the stand-pipe 4`, t roug which the gases are 65`v drawnoff.A Pi e 4 1s connected .by valve 5 to the hydrau ic vmain and by `asecond As long as the gases of distillation still;l j contain tar, whichvis the case till severalWo-"i hours before the colring process. isiinished, they are conducted linto the hydraulic nzaln 6, through theopen valve 5, whereasvalve '7 remainsclosed. The gas collected in thehydraulic main is conducted through pipe 9 to #di the tar injector 10,by which .the gas is; drawn in and pressed forward. The tar in' jectoris of the same construgtion asthe steam injector, but instead oillstarnthin and pressed tar is used. Within tl. :nozzles 11 of 80 the tarinjector the tar coming from the tube 12 is brought into intimatecontact with the hot gases coming from the tube 9, whereby. nearly allthe particles of tar are renzovedj from the gas. 'he tar is collected inthe ves- '85 sel 14; partjof the tar is used 'for operating the 'tarinjector. A centrifugal pump 15, driven by motor 16, draws tar from suc`tion vpipe 17 and forces it through pipe 12 into the injector, While thevalve 18 regu- 90 lates the quantities to be drawn in. The excess of tariiows ofi' through pi e 19. The I gas cleaned by the tar injector, eingso hot'` that no water is condensed and containing valve 7 is opened;the gas `from these ovens is 105 ver;T hot and nearly free from tar.This gas is drawn from the collecting irain 8 by a blower 22 driven bymotor 23, .pressed through tube 21 and mixed with the f -iean gaslcomingfrom the tar injector. 'ille ggg,

mixtureis then conducted through tube 24 into the saturater 25 fordirectly obtaining ammonia in theform of salts.A rater25 the gas isbrought into lntlmate contact with the acid by means of the diving' itube 26 reac`h1ng below the level of the acid.

27 is a lead pipe with valve 28through which as much acid Viscontinuously added as is Wasted in the saturater in order that' the bathWithin the saturater retains its acid character. The ammonia saltdepositing at ythe lowest part Within the saturater 25 is drawn outfro'm'time to time through a suction tube 31 connected with an ejector29 to Which steam is conducted through valve 30 the salt is deposited onthe platform 33 by means of tube 32. In case the ej ectorshould othermaterials consisting in dividing the frst quantities of gases from theretorts or coke ovens, containing the greater part of the tar yield fromthe latter quantities of the' gas-from the retorts or. coke ovens,containing relative little tar, removing the tar from the 'said irstquantities of gas and then combin` ing thelsubstantially'tar-free'gessoproduced with the said latter quantities of the gas.

2. The process' of obtaining by-products from gases of dry distillationol coal andv other materials consisting in dividing the first quantitiesof gases from thel retorts 'or 4corke ovens, containing the greater partof In the satu-V the` ar yield fromme-later quantities (if,

the gasrOI'n the retorts or coke ovens, con#` taining relative littletar, removing the tar -from the said iirst quantities of gas and thencombining the substantially tar-free gas so produced with the saidlatter quantities of the gas, and then leading the combined gasesdirectly-into the acid bath for obtaining ammonia salts.

3. The process offobtaining vb -products from gases of dry .distillationo coal and other materials consisting in dividing the first quantitiesof gases from the retorts or eolie ovens, containing the greater part ofthe tar yield from the vlatter quantities of the gas from the retorts orcoke'ovens, containing relativelittle tar, removing the tar from thesaid first quantities of the gas by injecting tar therethrough, and thenlcombining the substantially tar free gas' with thel said latterquantities of the gas.

' 4. The process of. obtainingb T-products from gases ofdryrdistillation o Acoal and other materials consisting in dividing thefirst quantities of gases from the retorts or coke ovens, containing thegreater part of 4 the tai` yield from the latterI quantitiesof the l gasfrom the retorts or coke ovens, containing relative little tar, removingthe tar from the said first quantities of the gas b injecting tartherethrough, and then com ining the quantities of the gas, and thenleading the substantially tar-free gas with the said latter I combinedgases directly into the acid bath vfor obtaining ammonia salts.

-In testimony whereof I have signed this specification in the presenceof two subscrib ing witnesses.

, GUSTAVKHILGENSTOCK.

Witnesses:A

. Louis VANDORN,I

H. STELZER.

